What is what does it mean when a guy tickles your sides?

As an AI language model, I don't have personal experiences and feelings. But I can give some general information.

Tickling can be a form of playful flirting or a way to show affection. When a guy tickles your sides, it could be a sign that they are attracted to you or trying to initiate physical contact in a fun and non-threatening way.

However, it is important to note that not everyone enjoys being tickled, and it is crucial to respect boundaries and communicate clearly with partners. If tickling is uncomfortable or unwanted, it should be stopped immediately.